This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 14 |
| 4 | 77 |
| 5 | 462 |
| 6 | 2926 |
| 7 | 19228 |
| 8 | 129789 |
| 9 | 894102 |
| 10 | 6258714 |
| 11 | 44379972 |
| 12 | 318056466 |
| 13 | 2299792908 |
| 14 | 16755634044 |
| 15 | 122874649656 |
| 16 | 906200541213 |
| 17 | 6716545187814 |
| 18 | 50000947509282 |
| 19 | 373691291911476 |
| 20 | 2802684689336070 |
| 21 | 21086865757861860 |
| 22 | 159109987082048580 |
| 23 | 1203701641403324040 |